Resistance material.



UNITED e'rAr isPAT NT oFFicn HENRY GEISENHONER,. Ol .'*-'(HE1\'ECTAI)Y, NEW YORK, ASSIGNOR TO GENERAL ELECTRIC I COM'I zXNY, A CORPORATION OF NEW YORK.

RESISTANCE MATERIAL.

No. 920,861. Specification of Letters Patent. Patented May 4, 1909. Application filed February 3, 1908. Serial No. 413,963.

To all whom it may concern: vary with the resistance required while the Be it known that I, HENRY GEISENHONER, l other materials may be varied within a. cona citizen of the United States, residing at siderable range depending upon the use to Schenectady, countyof Schenectady, Stateof which the resistance is to be subjected. New York, have invented certain new and The percentage of aluminum may be as high useful ImprovementsinResistance Materials, ,1 as 50% or even higher while a suitable roof which the following is a specification. portion of the calcium hydrate to the int This invention relates to resistance conin the binding base may be approximately (luctors for electric circuits and'has-for its l 2 to 3. I find it convenient to use the. i0 object the provision of a-material of such aluminum in the form of a flaky powder,

a character that the resistance may be varied such as is used in the manufacture o alumithrough a considerable range by varying the num paint. It is essential that the mixture composition and at the same time will with- E of the aluminum and the other materials stand a high temperature without injury, i be exceedingly thorough "so that the resist- 15 in addition to having sufficient strength for f ance of the stick in its final fo will be unigenera use and being exceedingly cheap, form otherwise the material w become hot eflicient anddurable. in spots or streaksf As a resistance it would My invention relates more s ecifically to Z not be dependable therefore and the stick what is known in the art as ino ded or comwill be eventually destroyed.

20 posite resistances. This type of resistance When the materials are thoroughly mixed has been well known for some time but has they are compressed into a condensed mass not been successful practically because of i and subjected to steam treatment, the prescertain objections which it has been found sure of which and therefore the temperature difficult to overcome. will depend somewhat upon the proportion of 25 It is the object of my invention therefore the aterials used and also upon the, time to overcome as far as possible the objections whicv is to be consumed in hardening. A heretofore urged'against this type of resistpressure of 150 pounds corresponding to a ance. I have found that the metal alumitemperature of 181 C. has been found to be mum is exceedingly welladapted for use in suflicient to harden certain compositions in 30 connection with this type of resistance. about five'hours; 'In treating the materialI This is so for various reasons among which find it advisable to protect the surface so that are found the facts that the material is selfthe metal will not bewashed away. This may protecting against more than a film oxidabe done by inclosing itin' a-mold during the tion, is refractory, is a good conductor, steam treatment, The steam converts the 5 bulky relative to other metals of equal calciumh drate and silica into ahydrous siliweight, and is well adapted for a mixture cate of caftium,which makes a strong'binder with non-conducting materials by reason for the aluminum. A of its slippery nature. I have described my invention in connec- One of my objects therefore is to roduce tion with certain materials-designed to be 40 a resistance stick in which the meta alumitreated in a specific manner, 'i. e. I have demini is mixed with other materials which scribed a specific binder for the-conducting constitute a binder. I material. It should be understoo(l,'however, In the practical working out of my'inventhat I do not limit my invention to the partion I have found that aluminum is very well ticular binding material nor to the spec fic 45 adapted for use in connection with the-binder process of treating the same since various described in an application of L. E. Barringer, modifications thereof will sug est themselves N 0; 299,143. 'lhis material is of such a to those skilled in the art w t iou-t departmg nature that when treated it produces asilifrom the spirit "of my invention, the scope of c'ate'which is highly refractory although not which is set forth in the annexed claims.

" requiring a high temperature in its produc- What I claim as new and desire to secure tion. In producing this particular form of by Letters Patent of theUnited-States, is,. resistance materialthereforeImix the desired 1. A resistance conductor compr sing a quantityofaluminumwithsuitablequantities compound of uncombined aluminum and a v of calcium or magnesium hydrate and silica. binder. 3

55 The quantity of aluminum will, of course, 2. A resistance conductor comprising a com ound of comminuted aluminum and a compound of comminuted aluminum and bin er. hydrous silicate of calcium.

.3. A resistance conductor comprising a 7. A resistance conductor comprising a 1-5 compound of uncombined aluminum and a steam hardened compound of uncombined 5 non-conductor aluminum and a hydrate.

4. A resistance conduetor com rising a In witness whereof, I have hereunto set compound of aluminum and a hy rous silimy hand this 31st day of January, 1908. cate.

5. A resistance conductor comprising a HENRY GEISENHONER 10 steam hardened compound of comminuted Witnesses:

aluminum with silica and a hydrate. BENJAMIN -B. HULL,

6. A resistance conductor comprising a HELEN ORFom). 

